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Liu Z, Gillis T, Raman S, Cui Q. A parametrized two-domain thermodynamic model explains diverse mutational effects on protein allostery. bioRxiv 2024:2023.08.06.552196. [PMID: 37662419 PMCID: PMC10473640 DOI: 10.1101/2023.08.06.552196] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/05/2023]
Abstract
New experimental findings continue to challenge our understanding of protein allostery. Recent deep mutational scanning study showed that allosteric hotspots in the tetracycline repressor (TetR) and its homologous transcriptional factors are broadly distributed rather than spanning well-defined structural pathways as often assumed. Moreover, hotspot mutation-induced allostery loss was rescued by distributed additional mutations in a degenerate fashion. Here, we develop a two-domain thermodynamic model for TetR, which readily rationalizes these intriguing observations. The model accurately captures the in vivo activities of various mutants with changes in physically transparent parameters, allowing the data-based quantification of mutational effects using statistical inference. Our analysis reveals the intrinsic connection of intra- and inter-domain properties for allosteric regulation and illustrate epistatic interactions that are consistent with structural features of the protein. The insights gained from this study into the nature of two-domain allostery are expected to have broader implications for other multidomain allosteric proteins.
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Affiliation(s)
- Zhuang Liu
- Department of Physics, Boston University, Boston, United States
| | - Thomas Gillis
- Department of Biochemistry, University of Wisconsin, Madison, United States
| | - Srivatsan Raman
- Department of Biochemistry, University of Wisconsin, Madison, United States
- Department of Chemistry, University of Wisconsin, Madison, United States
- Department of Bacteriology, University of Wisconsin, Madison, United States
| | - Qiang Cui
- Department of Physics, Boston University, Boston, United States
- Department of Chemistry, Boston University, Boston, United States
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Ginnard SM, Winkler AE, Mellado Fritz C, Bluhm T, Kemmer R, Gilliam M, Butkevich N, Abdrabbo S, Bricker K, Feiler J, Miller I, Zoerman J, El-Mohri Z, Khuansanguan P, Basch M, Petzold T, Kostoff M, Konopka S, Kociba B, Gillis T, Heyl DL, Trievel RC, Albaugh BN. Molecular investigation of the tandem Tudor domain and plant homeodomain histone binding domains of the epigenetic regulator UHRF2. Proteins 2021; 90:835-847. [PMID: 34766381 DOI: 10.1002/prot.26278] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2021] [Revised: 10/25/2021] [Accepted: 11/07/2021] [Indexed: 11/12/2022]
Abstract
Ubiquitin-like containing PHD and ring finger (UHRF)1 and UHRF2 are multidomain epigenetic proteins that play a critical role in bridging crosstalk between histone modifications and DNA methylation. Both proteins contain two histone reader domains, called tandem Tudor domain (TTD) and plant homeodomain (PHD), which read the modification status on histone H3 to regulate DNA methylation and gene expression. To shed light on the mechanism of histone binding by UHRF2, we have undergone a detailed molecular investigation with the TTD, PHD and TTD-PHD domains and compared the binding activity to its UHRF1 counterpart. We found that unlike UHRF1 where the PHD is the primary binding contributor, the TTD of UHRF2 has modestly higher affinity toward the H3 tail, while the PHD has a weaker binding interaction. We also demonstrated that like UHRF1, the aromatic amino acids within the TTD are important for binding to H3K9me3 and a conserved aspartic acid within the PHD forms an ionic interaction with R2 of H3. However, while the aromatic amino acids in the TTD of UHRF1 contribute to selectivity, the analogous residues in UHRF2 contribute to both selectivity and affinity. We also discovered that the PHD of UHRF2 contains a distinct asparagine in the H3R2 binding pocket that lowers the binding affinity of the PHD by reducing a potential electrostatic interaction with the H3 tail. Furthermore, we demonstrate the PHD and TTD of UHRF2 cooperate to interact with the H3 tail and that dual domain engagement with the H3 tail relies on specific amino acids. Lastly, our data indicate that the unique stretch region in the TTD of UHRF2 can decrease the melting temperature of the TTD-PHD and represents a disordered region. Thus, these subtle but important mechanistic differences are potential avenues for selectively targeting the histone binding interactions of UHRF1 and UHRF2 with small molecules.
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Affiliation(s)
- Shane M Ginnard
- Department of Chemistry, Eastern Michigan University, Ypsilanti, Michigan, USA
| | - Alyssa E Winkler
- Department of Chemistry, Eastern Michigan University, Ypsilanti, Michigan, USA
| | | | - Tatum Bluhm
- Department of Chemistry, Eastern Michigan University, Ypsilanti, Michigan, USA
| | - Ray Kemmer
- Department of Chemistry, Eastern Michigan University, Ypsilanti, Michigan, USA
| | - Marisa Gilliam
- Department of Chemistry, Eastern Michigan University, Ypsilanti, Michigan, USA
| | - Nick Butkevich
- Department of Chemistry, Eastern Michigan University, Ypsilanti, Michigan, USA
| | - Sara Abdrabbo
- Department of Chemistry, Eastern Michigan University, Ypsilanti, Michigan, USA
| | - Kaitlyn Bricker
- Department of Chemistry, Eastern Michigan University, Ypsilanti, Michigan, USA
| | - Justin Feiler
- Department of Chemistry, Eastern Michigan University, Ypsilanti, Michigan, USA
| | - Isaak Miller
- Department of Chemistry, Eastern Michigan University, Ypsilanti, Michigan, USA
| | - Jenna Zoerman
- Department of Chemistry, Eastern Michigan University, Ypsilanti, Michigan, USA
| | - Zeineb El-Mohri
- Department of Chemistry, Eastern Michigan University, Ypsilanti, Michigan, USA
| | - Panida Khuansanguan
- Department of Chemistry, Eastern Michigan University, Ypsilanti, Michigan, USA
| | - Madyson Basch
- Department of Chemistry, Eastern Michigan University, Ypsilanti, Michigan, USA
| | - Timothy Petzold
- Department of Chemistry, Eastern Michigan University, Ypsilanti, Michigan, USA
| | - Matthew Kostoff
- Department of Chemistry, Eastern Michigan University, Ypsilanti, Michigan, USA
| | - Sean Konopka
- Department of Chemistry, Eastern Michigan University, Ypsilanti, Michigan, USA
| | - Brendon Kociba
- Department of Chemistry, Eastern Michigan University, Ypsilanti, Michigan, USA
| | - Thomas Gillis
- Department of Chemistry, Eastern Michigan University, Ypsilanti, Michigan, USA
| | - Deborah L Heyl
- Department of Chemistry, Eastern Michigan University, Ypsilanti, Michigan, USA
| | - Raymond C Trievel
- Department of Biological Chemistry, University of Michigan, Ann Arbor, Michigan, USA
| | - Brittany N Albaugh
- Department of Chemistry, Eastern Michigan University, Ypsilanti, Michigan, USA
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Mattis VB, Svendsen SP, Ebert A, Svendsen CN, King AR, Casale M, Winokur ST, Batugedara G, Vawter M, Donovan PJ, Lock LF, Thompson LM, Zhu Y, Fossale E, Atwal RS, Gillis T, Mysore J, Li JH, Seong IS, Shen Y, Chen X, Wheeler VC, MacDonald ME, Gusella JF, Akimov S, Arbez N, Juopperi T, Ratovitski T, Chiang JH, Kim WR, Chighladze E, Watkin E, Zhong C, Makri G, Cole RN, Margolis RL, Song H, Ming G, Ross CA, Kaye JA, Daub A, Sharma P, Mason AR, Finkbeiner S, Yu J, Thomson JA, Rushton D, Brazier SP, Battersby AA, Redfern A, Tseng HE, Harrison AW, Kemp PJ, Allen ND, Onorati M, Castiglioni V, Cattaneo E, Arjomand J. A11 Induced pluripotent stem cells for basic and translational research on HD. J Neurol Neurosurg Psychiatry 2012. [DOI: 10.1136/jnnp-2012-303524.11] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Lee JM, Ramos EM, Lee JH, Gillis T, Mysore JS, Hayden MR, Warby SC, Morrison P, Nance M, Ross CA, Margolis RL, Squitieri F, Orobello S, Di Donato S, Gomez-Tortosa E, Ayuso C, Suchowersky O, Trent RJA, McCusker E, Novelletto A, Frontali M, Jones R, Ashizawa T, Frank S, Saint-Hilaire MH, Hersch SM, Rosas HD, Lucente D, Harrison MB, Zanko A, Abramson RK, Marder K, Sequeiros J, Paulsen JS, Landwehrmeyer GB, Myers RH, MacDonald ME, Gusella JF. CAG repeat expansion in Huntington disease determines age at onset in a fully dominant fashion. Neurology 2012; 78:690-5. [PMID: 22323755 DOI: 10.1212/wnl.0b013e318249f683] [Citation(s) in RCA: 220] [Impact Index Per Article: 18.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
OBJECTIVE Age at onset of diagnostic motor manifestations in Huntington disease (HD) is strongly correlated with an expanded CAG trinucleotide repeat. The length of the normal CAG repeat allele has been reported also to influence age at onset, in interaction with the expanded allele. Due to profound implications for disease mechanism and modification, we tested whether the normal allele, interaction between the expanded and normal alleles, or presence of a second expanded allele affects age at onset of HD motor signs. METHODS We modeled natural log-transformed age at onset as a function of CAG repeat lengths of expanded and normal alleles and their interaction by linear regression. RESULTS An apparently significant effect of interaction on age at motor onset among 4,068 subjects was dependent on a single outlier data point. A rigorous statistical analysis with a well-behaved dataset that conformed to the fundamental assumptions of linear regression (e.g., constant variance and normally distributed error) revealed significance only for the expanded CAG repeat, with no effect of the normal CAG repeat. Ten subjects with 2 expanded alleles showed an age at motor onset consistent with the length of the larger expanded allele. CONCLUSIONS Normal allele CAG length, interaction between expanded and normal alleles, and presence of a second expanded allele do not influence age at onset of motor manifestations, indicating that the rate of HD pathogenesis leading to motor diagnosis is determined by a completely dominant action of the longest expanded allele and as yet unidentified genetic or environmental factors.
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Affiliation(s)
- J-M Lee
- Center for Human Genetic Research, Massachusetts General Hospital, Boston, MA, USA
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Ramos EM, Gillis T, Mysore J, Abuelneel K, Gusella J, MacDonald M, Lee JM, Alonso I, Sequeiros J. C03 Modifiers of instability and age at onset in HD: haplotype study in the Portuguese population. J Neurol Neurosurg Psychiatry 2010. [DOI: 10.1136/jnnp.2010.222588.3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Gillis T, Vissa V, Matsuoka M, Young S, Richardus JH, Truman R, Hall B, Brennan P, The Ideal Consortium Partners. Characterisation of Short tandem repeats for genotyping Mycobacterium leprae. LEPROSY REV 2009. [DOI: 10.47276/lr.80.3.250] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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7
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Gillis T, Vissa V, Matsuoka M, Young S, Richardus JH, Truman R, Hall B, Brennan P. Characterisation of short tandem repeats for genotyping Mycobacterium leprae. LEPROSY REV 2009; 80:250-260. [PMID: 19994470] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
OBJECTIVE Establish a typing system for Mycobacterium leprae based on polymorphic DNA structures known as short tandem repeats (STR). DESIGN Assess 16 polymorphic STR for sensitivity, specificity and reproducibility in standard assays using reference strains of M. leprae. RESULTS Primers for 16 STR loci were selected based on PCR product size and for their ability to sequence each STR locus from both directions. All primer pairs produced a visible PCR amplicon of appropriate size from PCR reactions containing 10 M. leprae cells. DNA sequences for each STR locus, except (AT) 15, was correctly identified as M. leprae-specific in replicate samples containing 1000 M. leprae using either the forward or reverse PCR primers. Twelve of 13 M. leprae STR loci were stable during passage in heavily infected armadillo tissues over a 5 year and 7 month infection cycle. CONCLUSIONS Certain M. leprae STR provide suitable targets for strain typing with the potential for grouping M. leprae with shared genotypes that may prove useful for establishing linkages between leprosy cases within geographical regions.
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Affiliation(s)
- Thomas Gillis
- National Hansen's Disease Programs, Baton Rouge, LA 70803, USA.
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Moser K, Biglan KM, Ross CA, Langbehn DR, Aylward E, Stout JC, Queller S, Carlozzi N, Duff K, Beglinger LJ, Paulsen JS, Tomusk A, Lifer S, Hastings S, Dawson J, Walker B, Whitlock K, Johnson S, Pacifici R, Hersch S, Dorsey ER, Katz R, Tempkin T, Wheelock V, Schwartz G, Corey-Bloom J, Mattis P, Feigin A, Young P, McArthur DL, Perlman S, Higginson C, Carr L, Sigvardt K, Chirieac MC, Shinaman A, Shoulson I, Kane AE, Peavy GM, Goldstein JL, Jacobson MW, Lessig S, Wasserman L, Kayson EP, Tang C, Zgaljardic D, Ma Y, Dhawan V, Guttman M, Eidelberg D, Peng S, Kingsley P, Rosas HD, Gevorkian S, Oakes D, Matson W, Massood T, Latourelle J, Mysore JS, Fossale E, Gillis T, Gusella JF, MacDonald ME, Myers RH, Yastrubetskaya O, Preston J, Chiu E, Goh A, Oster E, Bausch J, Kayson E, Quaid K, Sims S, Swenson M, Harrison J, Moskowitz C, Stepanov N, Suter G, Westphal B, Johnson SA, Langbehn D, Paulsen J, Nopoulos P, Beglinger L, Johnson H, Magnotta V, Pierson R, Lipe H, Bird TD, McCusker EA, Lownie A, Lechich AJ, Montas S, Duckett A, Klager J, Sandler S, Pae A, Apostol BL, Simmons DA, Zuccato C, Illes K, Pallos J, Casale M, Kathuria S, Cattaneo E, Marsh JL, Thompson LM, Patzke H, Chesworth R, Li Z, Rahil G, Wang J, Smith J, Huet FL, Shapiro G, Leit S, Beaulieu P, Raeppel F, Fournel M, Sainte-Croix H, Nolan SJ, Albayya FP, Barbier A, Besterman J, Ahlijanian MK, Deziel R, Aubeeluck A, Buchanan H, Ross C, Biglan K, Landwehrmeyer B, Whitlock KB, Carlozzi NE, Mickes L, Lee J, Kim RY, Toro B, Fine E, Cahill T, Johnson D, Goldstein J, Peavy G, Jacobson M, Goodman LV, Como PG, Cha JH, Beck C, Adams M, Chadwick G, Blieck EA, McCallum C, Deuel L, Clarke A, Stewart R, Adams WH, Paulson H, Fiedorowicz JG, Hanson JM, Ramza N, Priller J, Ecker D. Inaugural Huntington Disease Clinical Research Symposium Organized by the Huntington Study Group. Neurotherapeutics 2008. [DOI: 10.1016/j.nurt.2007.10.053] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
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10
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Gillis T. Is there a role for a vaccine in leprosy control? LEPROSY REV 2007; 78:338-342. [PMID: 18309707] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Affiliation(s)
- Thomas Gillis
- Laboratory Research Branch, National Hansen's Disease Programs, LSU School of Veterinary Medicine, Baton Rouge, LA 70803, USA.
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Truman R, Fontes AB, De Miranda AB, Suffys P, Gillis T. Genotypic variation and stability of four variable-number tandem repeats and their suitability for discriminating strains of Mycobacterium leprae. J Clin Microbiol 2004; 42:2558-65. [PMID: 15184434 PMCID: PMC427888 DOI: 10.1128/jcm.42.6.2558-2565.2004] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
Abstract
It has not been possible to distinguish different strains of Mycobacterium leprae according to their genetic sequence. However, the genome contains several variable-number tandem repeats (VNTR), which have been used effectively in strain typing of other bacteria. To determine their suitability for differentiating M. leprae, we developed PCR systems to amplify 5 different VNTR loci and examined a battery of 12 M. leprae strains derived from patients in different regions of the United States, Brazil, Mexico, and the Philippines, as well as from wild armadillos and a sooty mangabey monkey. We found diversity at four VNTR (D = 0.74), but one system (C(16)G(8)) failed to yield reproducible results. Alleles for the GAA VNTR varied in length from 10 to 16 copies, those for AT(17) varied in length from 10 to 15 copies, those for GTA varied in length from 9 to 12 copies, and those for TA(18) varied in length from 13 to 20 copies. Relatively little variation was seen with interspecies transfer of bacilli or during short-term passage of strains in nude mice or armadillos. The TA(18) locus was more polymorphic than other VNTR, and genotypic variation was more common after long-term expansion in armadillos. Most strain genotypes remained fairly stable in passage, but strain Thai-53 showed remarkable variability. Statistical cluster analysis segregated strains and passage samples appropriately but did not reveal any particular genotype associable with different regions or hosts of origin. VNTR polymorphisms can be used effectively to discriminate M. leprae strains. Inclusion of additional loci and other elements will likely lead to a robust typing system that can be used in community-based epidemiological studies and select clinical applications.
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Affiliation(s)
- Richard Truman
- NHDP at LSU, P.O. Box 25072, Baton Rouge, LA 70894, USA.
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Gillis T. Anti-apoptotic Effects of the PPARgamma Agonist Rosiglitazone on Aortic Endothelial Cells in Hypercholesterolemic Rabbits. Acad Emerg Med 2003. [DOI: 10.1197/aemj.10.5.558] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Janjan NA, Payne R, Gillis T, Podoloff D, Libshitz HI, Lenzi R, Theriault R, Martin C, Yasko A. Presenting symptoms in patients referred to a multidisciplinary clinic for bone metastases. J Pain Symptom Manage 1998; 16:171-8. [PMID: 9769619 DOI: 10.1016/s0885-3924(98)00069-4] [Citation(s) in RCA: 68] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/09/2023]
Abstract
Symptom control is the goal of palliative irradiation. Approximately 1 month is required before symptomatic relief is accomplished with radiotherapy. However, many patients with cancer-related pain do not receive adequate analgesics, and opioids are often not prescribed until patients fail to respond to palliative irradiation. The presenting symptoms of 108 patients who were referred to a multidisciplinary clinic for bone metastases were evaluated with the Wisconsin Brief Pain Inventory (BPI). This validated instrument evaluates the severity of pain using a 0-10 scale; 10 represents the worst pain imaginable. The population comprised 65 men (60%) and 43 women whose ages ranged from 33 years to 81 years; median age was 55 years, and 69% of patients were less than 65 years of age. Despite the presence of metastatic disease, 21% of patients were working full-time outside the home, and 6% were employed part-time outside the home; 13% were homemakers. Only 17 patients (16%) were unemployed. The time since diagnosis ranged from 2 weeks to 23 years; the median time since diagnosis was 22 months, and 30% of patients had been diagnosed with the past 6 months. Pain was a presenting symptom in 74% (N = 80) of patients at diagnosis. At its worst, the pain was rated as severe (levels 7-10) by 78% and intolerable (level 10) in 22% of the patients in the 24 hr prior to the clinic appointment. On average, the pain was rated moderate to severe (levels 4-10) in 79% and severe in 23% of patients. Only 45% of patients experienced good relief from the prescribed analgesics, and 23% of patients indicated that the prescribed analgesics were ineffective. This survey demonstrates that bone metastases incur significant pain that is often undertreated with analgesics before antineoplastic therapy is administered.
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Affiliation(s)
- N A Janjan
- Department of Radiotherapy, University of Texas, M. D. Anderson Cancer Center, Houston 77030, USA
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Gillis T. PFI (Private Finance Initiative) and IT (information technology) managed services. Health Estate J 1996; 50:8. [PMID: 10162529] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Ollo C, Alim TN, Rosse RB, Lindquist T, Green T, Gillis T, Ricci J, Khan M, Deutsch SI. Lack of neurotoxic effect of diethylpropion in crack-cocaine abusers. Clin Neuropharmacol 1996; 19:52-8. [PMID: 8867517 DOI: 10.1097/00002826-199619010-00003] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Dopamine agonists have been used with some success in treating cocaine addiction. However, both cocaine and psychostimulants have been reported to produce neurotoxic effects. We evaluated the effect of the stimulant diethylpropion on cognitive performance in a double-blind, placebo-controlled trial. Forty-six abstinent crack-cocaine users received either placebo, 25-mg, 50-mg, or 75-mg doses of diethylpropion. Patients were tested at baseline and again after 9-14 days of medication. There were no differences between placebo and medication groups on any test, indicating that, within the time frame studied, diethylpropion does not produce neurotoxic effects that can be detected with standardized neuropsychological tests.
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Affiliation(s)
- C Ollo
- NIDA Research Unit/Psychiatry Service, Department of Veterans Affairs Medical Center, Washington, DC 20422, USA
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Pennacchio JL, Hong WK, Shapshay S, Gillis T, Vaughan C, Bhutani P, Ucmakli A, Katz AE, Bromer R, Willet B, Strong SM. Combination of cis-platinum and bleomycin prior to surgery and/or radiotherapy compared with radiotherapy alone for the treatment of advanced squamous cell carcinoma of the head and neck. Cancer 1982; 50:2795-801. [PMID: 6182982 DOI: 10.1002/1097-0142(19821215)50:12<2795::aid-cncr2820501218>3.0.co;2-0] [Citation(s) in RCA: 48] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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17
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Friedberg J, Gillis T. Tympanoplasty in childhood. J Otolaryngol 1980; 9:165-8. [PMID: 6990012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Seventy cases of tympanoplasty in children in whom disease appeared to be limited to the mesotympanum were reviewed. Careful pre-operative selection is recommended; however, the surgery itself presented no particular problems. Success in closure of the perforation and improvement in hearing is comparable to adult studies.
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